Cirsium
thistle
12 species
3 subspecies and varieties
Show only taxa with photos
Order by:
Scientific name
Common name
Display as:
Cirsium arvenseCanada thistle, Canadian thistle, creepiing thistle
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Noxious weed that thrives in a variety of habitats.
Origin: Introduced from Eurasia
Flowers: June-October
Cirsium brevifoliumPalouse thistle
Distribution: Southeast Washington, northeast Oregon and adjacent Idaho
Habitat: Grasslands at low elevations
Origin: Native
Flowers: June - October
Cirsium brevistylumclustered thistle, short styled thistle
Distribution: British Columbia to northern California, east to Montana
Habitat: Moist places at low to moderate elevations in the mountains
Origin: Native
Flowers: June - August
Cirsium eduleedible thistle
Distribution: British Columbia to Oregon, from the coast to the east slope of the Cascades
Habitat: In forest openings from low elevations near the coast to mid-elevations in the mountains
Origin: Native
Flowers: July - September
var. edule – edible thistle, Indian thistle, Macoun's thistle
var. wenatchense – Wenatchee thistle
Cirsium flodmaniiFlodman's thistle
Origin: Native
Cirsium foliosumleafy thistle
Origin: Native
Cirsium hookerianumHooker's thistle, white thistle
Distribution: East of the Cascades, British Columbia and Washington, east to Alberta and Montana
Habitat: Moist lowlands, open slopes and fields
Origin: Native
Flowers: July - August
Cirsium inamoenumGreene's thistle
Origin: Native
var. inamoenum – Greene's thistle
Cirsium remotifoliumfewleaf thistle, remote-leaved thistle
Origin: Native
Flowers: June - September
Cirsium scariosumelk thistle, meadow thistle
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Moist meadows in the foothills to fairly high elevations in the mountains.
Origin: Native
Flowers: June-August
Cirsium undulatumwavy leaf thistle
Distribution: East of the Cascades in Washington; British Columbia south to California, east to Michigan and Texas.
Habitat: Dry hillsides and plains at low elevations.
Origin: Native
Flowers: May-September
Cirsium vulgarebull thistle, common thistle
Distribution: Widely distributed throughout Washington; widely distributed throughout the United States and Canada.
Habitat: Common weed from the lowlands to logged areas in the mountains.
Origin: Introduced from Eurasia
Flowers: July-September